Lightweight helps in addition to understable driver. I mean, it's a wooded tunnel so you don't have to worry about wind. I keep a 155 Champ Leo just for long tunnels like this, rip it on a hyzer flip and pray.

Or you could use a very stable driver and throw a low full power flex shot. It's just routine really.

After some thoughts, I think hyzer flipping a light Leopard would be a better choice haha!
However, reading what you said earlier, it seems that it's your second shots that is actually giving you problem... Sometimes, when the ceiling is very low and the distance to travel is far (relative to the ceiling's height, say 150+), an understable driver works better. You can start it straight and low and let it skip forward to the basket. It all depends on the ground off course.

Before I 'knew' how to throw, I tended to swing my arm wider around my body rather than pull through lawn mower style. Inadvertently, I was able to put a lot of power into understable discs in order to get any distance with a shot that resembled a long, gentle flex. I could pitch a Leopard, Monarch or MRV out there on a line to 250'. I almost can't help but to reach back these days but with much less power and a minor flex release. With enough power and the right release angle, these days a Roc for me can hold that gentle right flex, slowly straightening up. Give yourself a little space for the disc to work from left back to center and I'm confident it'll hold air for 200 feet with your ceiling, grounding out before it has time to fade.